South Park
Big Gay Al's Big Gay Boatride
S1 E4:
Stan's got a new dog-named Sparky. Stan proclaims his pet to be the toughest dog on the mountain. Though while Stan thinks his dog is ready for fighting, Sparky proceeds to hump Sylvester like a little bitch. The other boys taunt Stan about his gay dog and Sparky runs away to find someone who will love him for who he is.